“..there is no such thing as a logical method of having new ideas, or a logical reconstruction of this process. My view may, be expressed by saying that every discovery contains ‘an irrational element’, or ‘a creative intuition’, in Bergson’s sense.“

Karl Popper. “Logic of Scientific Discovery” p32.

"In teaching, a scientific base is currently available, at least in part, and can be further developed. Yet such scientific illumination does not diminish the need for artistry in teaching." N. L. Gage. "Scientific Basis of the Art of Teaching" (1978)